Influence of La₂Zr₂O₇ Additive on Densification and Li⁺ Conductivity for Ta-Doped Li₇La₃Zr₂O₁₂ Garnet

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• 作者：Xiao Huang ; Chen Shen ; Kun Rui ; Jun Jin ; Meifen Wu ; Xiangwei Wu ; Zhaoyin Wen
• 刊名：JOM Journal of the Minerals, Metals and Materials Society
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：68
• 期：10
• 页码：2593-2600
• 全文大小：1,775 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Materials Science
  Metallic Materials
  Nanotechnology
  Crystallography
  
• 出版者：Springer Boston
• ISSN：1543-1851
• 卷排序：68

文摘

A high-conductivity solid electrolyte, La₂Zr₂O₇ (LZO) added to Li_6.4La₃Zr_1.4Ta_0.6O₁₂ (LLZTO), was prepared via conventional solid-state reactions and sintered at 1100°C for 10 h, which is tens of Celsius degrees lower than the typical sintering temperature for LLZTO. The addition of LZO did not bring in any impurities. LZO acted as a sintering aid to densify the LLZTO from a relative density of 77% up to 90%, which was comparable to that of pure LLZTO sintered at 1200°C. The 6 wt.% LZO–LLZTO samples sintered at 1100°C and 1200°C exhibited a room-temperature conductivity of 1.92 × 10−4 S/cm and 5.84 × 10−4 S/cm, respectively, which were higher than that of pure LLZTO samples. Glass-like phases observed at grain boundaries in LZO–LLZTO ceramics indicated that LZO promoted the formation of the glass-like phases binding together LLZTO grains and thus leading to enhanced density and conductivity of LLZTO.